Lafayette School Corporation

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Lafayette School Corporation

• Fraz Ahmed (Team Leader)
• Brian Balogh
• Omar Fouad
• Babar Moghal
• Mukund Raghu

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Weather Station

• Omar Fouad
• Babar Moghal

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Objectives

• Lightning Detector
• Design and construct lightning detector circuit
• Interface with a computers serial port
• Log each lightning strikes date and time into a
  data file
• 1 minute interval minimum between strikes so 1
  lightning strike isnt counted more than once
• Network wide data capability (Website)
• Take weather software and lightning data files
  and post information on website
• Graph and Plot Data using Excel

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Fielded Project
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Lightning Detector
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Previous Lightning Detector Idea

• Previous design had to be fed into an interface
  circuit and then a counter circuit
• Powered using a 9-volt battery
• When talking to previous members it was suggested
  to find a new design

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Lightning Detector

• 2-3 foot extendable antenna
• 5 volt dc power supply using ac adapter
• Uses basic electronic components
• Resistors, Inductors, Capacitors, Diodes, and
  Transistors
• Pulse Output
• Circuit does not need interface board

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Where are we now

• We have replaced old lightning detector with our
  new circuit
• We have gathered all the parts and components and
  built a prototype circuit
• We are currently testing and debugging the
  circuit
• We have a plan to finish by end of spring 2005

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A snapshot of the circuit
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Where we are going

• We have to continue further testing and check for
  the correct output
• With the completed circuit we will interface with
  a computers serial port
• A data file will be made with the date and time
  of each lightning strike

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Where we are going

• Website will post links to download both weather
  station and lightning detector data files
• Website will be host of current weather variables
• Skeleton excel file will be made so students can
  import weather data to view graphs and figures

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PENDULUM PROJECT

• Lafayette School Corporation

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TEAM MEMBERS

• Fraz Ahmed (project leader)
  
• -Senior Electrical Engineer, 3rd semester epics
• Mukund Raghu
• -Senior Electrical Engineer, 3rd semester epics
• Brian Balogh
• -Senior Electrical Engineer, 2nd semester epics

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Purpose

• To provide a tool to educate high school students
  about the physical concept of pendulum motion
• To produce three working pendulums using
  electromagnetic force, optical sensors,
  stopwatches, circuitry, and a car race track to
  create students interest in engineering

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Customer Specifications

• Construct a device that would explain basic 9th
  grade concepts, while generating students
  interest in engineering
• Provide a device that is easy to handle
• Device has to be detachable for easy storage
• The theory explained should be easily
  comprehended by students and pertains to their
  curriculum

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Work Accomplished (Sp2004)

• Completed basic structure of the pendulum
• Built circuits for the sensors, stop watch and
  race car track
• Got basic prototype to work

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Significance of race car track

• The three race cars each correspond to a
  particular pendulum
• The car corresponding to the pendulum with the
  highest frequency wins
• Each student chooses a race car to win based on
  his/her perception of the factors that affect the
  time period of each pendulum
• Fun way of learning that mass does not affect
  motion, only length does

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Problems faced in the project

• Packaging of device (device has to be safe and
  reliable)
• The basic pendulum structure does not oscillate
  consistently in its set path
• Large initial angles led to error in displaying
  theoretical pendulum motion
• Integration of the three sensor circuits
• Coming up with better packaging for the
  electromagnets

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Modifications Made

• Our present pendulum structure is a one piece
  metal rod that resembles a T. This is hung from
  the beam by metal brackets. Ball bearings between
  rod and brackets reduces friction considerably
• We have made the maximum height of pendulum
  displacement 45 degrees. This is a small angle
  and does not affect the frequency of oscillation
• Use of solenoids to overcome design problems of
  electromagnets
• Designed a new structure for the pendulum frame

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Frame Structure

• Slotted the base so that the rear extension can
  be fitted in
• Plexiglas cover to display and shield electronics
• Dove tail for rear upright section to slide on

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Base
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Extension
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Shield
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Top
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Upright
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Semester Accomplishments

• Redesigned the pendulum to minimise error due to
  sin(theta) as well as friction
• Redesigned frame of pendulum and submitted
  drawings to womens prison
• Addressed safety and durability issues

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Future Plans

• Integrate Circuits
• Have Womens Prison build frame
• Have Machine Shop build pendulum and bearings
• Assemble all components
• Test and deliver project

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Conclusion

• We focused primarily on redesigning the pendulum
  and the frame.
• Due to the wait at womens prison, delivery has
  to be delayed until next semester

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Motorized Cart Project

• Lafayette School Corporation

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Team Members

• Mukund Raghu (Project leader)
  
• -Senior Electrical Engineer, 3rd semester epics
• Fraz Ahmed
• -Senior Electrical Engineer, 3rd semester epics

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Purpose

• To develop a device that assists a physically
  challenged student to interact with his/her
  classmates
• To produce a motorized cart which allows the
  student to maneuver on his/her own while ensuring
  safety

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Customer Specification

• Cart must be at least 36 in length and 18 wide
• Device must move at walking speed
• Student should be able to safely lay on the
  device and maneuver it within the school
  environment
• Use Velcro or Plug-in straps to secure the
  student on to the device
• Steering device should be similar to students
  current wheelchair to make it easy for the
  student to steer the device

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Design of Motor

• Variables
• T angular displacement (rad.)
• ? angular velocity (rad./sec.)
• a acceleration (rad./sec.2)
• t torque (Nm)
• n gear ratio
• J inertia
• m mass of student plus cart
• r radius of tire

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Design of Motor

• Diagram of system

n
?
J1
t1, T1

t2, T2
J2
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Design of Motor

• Equations
• t1 J1 a1 t
• t2 J2 a2
• t1/ t 1/n t/ t2
• T2/ T1 n
• n2 t1/?1 t2/?2
• t1 (J1 n2J2) a1
• J2 mr a1 ? conversion of rotational to
  translation motion
• T(S)/W(S) (J1(S) n2mr)S2 ? Laplace eqn.

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Regulation

• U.S. regulation requires 130 inclination for
  handicap
• Our design will increase it to a 230 ratio to
  increase safety

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Conclusion

• The initial design has been started and will
  continue into next semester
• A prototype will be constructed next semester